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प्रश्न
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
उत्तर
- 2Na + H2O → 2NaOH + H2
- AgNO3 + NaCl → AgCl + NaNO3
- 2KClO3 → 2KCl + 3O2
- 6CO2 + 6H2O → C6H12O6 + 6O2
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Give reason.
Wasp sting is treated with vinegar.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
How is a strong electrolyte different from a weak electrolyte?
Fill in the blank.
Melting of ice is a _______ change.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Rusting of iron is a ______ chemical change.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Give an example of a reaction where the following are involved
Electricity
Write the chemical reaction where the following changes are observed.
Colour change is noticed
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give a word equation for the following reaction.
Two gases which combine to give a solid.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Burning of paper is a ______ change.
______ change results in the change of the substance.
______ is a natural indicator.
Give two examples for each of the following cases:
Chemical changes.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
